The most useful solution for this is to install larger jets in that carb. You can also verify that you have a fuel return restrictor in the return line and if not then to install one. That should help keep the fuel flow through that last carb fine. Some people have even installed a dedicated fuel line and pump directly to that carb.
On a side note, you can easily check rich/lean conditions on a cylinder by pulling the spark plugs and looking at the coloration of the white ceramic insulator. The darker the brown the richer the mixture; you want it to be about a light chocolate color. The best way to check the plugs like this is to do a full throttle pull and kill the engine while on the throttle. Then look at the plugs.
On a side note, you can easily check rich/lean conditions on a cylinder by pulling the spark plugs and looking at the coloration of the white ceramic insulator. The darker the brown the richer the mixture; you want it to be about a light chocolate color. The best way to check the plugs like this is to do a full throttle pull and kill the engine while on the throttle. Then look at the plugs.
